access

accommodation

apartment

authentication

authorized

bedroom

black

card

cardkey

code

control

door

electronic

enter

entrance

entry

hand

home

hotel

identification

indoors

insert

intruder

key

keycode

keyhole

leave

lock

man

modern

nobody

open

pass

plastic

precaution

privacy

protect

protection

room

safeguard

safety

secure

security

service

suit

system

technology

unlock

validation